Revert of Move NumberOfPlanesForGpuMemoryBufferFormat to gfx

ui/gfx/buffer_format_util.h

Index: ui/gfx/buffer_format_util.h
diff --git a/ui/gfx/buffer_format_util.h b/ui/gfx/buffer_format_util.h
deleted file mode 100644
index 96b18595bb81ee779d330f91de01b7a9a1b808b3..0000000000000000000000000000000000000000
--- a/ui/gfx/buffer_format_util.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef UI_GFX_BUFFER_FORMAT_UTIL_H_
-#define UI_GFX_BUFFER_FORMAT_UTIL_H_
-
-#include "base/basictypes.h"
-#include "ui/gfx/buffer_types.h"
-#include "ui/gfx/gfx_export.h"
-
-namespace gfx {
-
-// Returns the number of planes for |format|.
-GFX_EXPORT size_t NumberOfPlanesForBufferFormat(BufferFormat format);
-
-}  // namespace gfx
-
-#endif  // UI_GFX_BUFFER_FORMAT_UTIL_H_